Across
- 5. The amount of space that a substance occupies.
- 6. A state of matter with a fixed shape and a fixed volume. Its particles are tightly packed and vibrate in place.
- 8. A state of matter with a fixed volume but no fixed shape; it takes the shape of its container. Its particles are close but can flow past one another.
- 11. The force exerted by gas particles when they collide with the walls of their container.
- 13. The change of state from a solid to a liquid, caused by adding heat energy.
- 14. The direct change of state from a solid to a gas without becoming a liquid first (e.g., dry ice).
- 15. A state of matter with no fixed shape or volume; it expands to fill its container. Its particles are far apart and move quickly.
Down
- 1. The tiny atoms or molecules that all matter is made from. Their arrangement and energy determine the state of matter.
- 2. The change of state from a gas to a liquid, caused by cooling.
- 3. The change of state from a liquid to a gas at the surface of the liquid, and at any temperature.
- 4. The process where particles spread out from an area of high concentration to an area of low concentration. It happens fastest in gases.
- 7. The fixed or changing form of a substance.
- 9. The mass of a substance per unit volume (how much 'stuff' is packed into a space). Solids are typically most dense, gases least.
- 10. The change of state from a liquid to a solid, caused by removing heat energy.
- 12. (In this context, usually heat energy) Added or removed during changes of state. More energy makes particles move faster.